상황
A stereo preamp volume control uses an Arduino Nano to send I2C commands to a PT2258, with I2C pull-ups and power decoupling for clean control.
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01
Use generic IC symbols for the Arduino Nano and PT2258 to keep the schematic renderable without pin-level library details
02
Add 4.7k pull-up resistors on SDA and SCL to 5V for reliable I2C signaling
03
Include 100nF and 10uF decoupling capacitors on the 5V rail and model audio in/out with AC sources and 10k loads
When documenting or teaching the wiring of an I2C-controlled volume IC with a microcontroller and stereo preamp signals.